caving [ˈkeɪvɪŋ]

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附加级

n.崩落开采法；垮落；放顶；窟窿

He had always wanted to go caving . 他过去一直想探索洞穴。
With the roof caving in, there were an increasing number of desertions. 由于大势已去，逃兵的人数日益增多。来自辞典例句